/**********************************************************************************
 * $URL$
 * $Id$
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009 The Sakai Foundation
 *
 * Licensed under the Educational Community License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *       http://www.opensource.org/licenses/ECL-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
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package org.sakaiproject.component.kerberos.user;
import java.io.IOException;

import javax.security.auth.callback.Callback;
import javax.security.auth.callback.CallbackHandler;
import javax.security.auth.callback.UnsupportedCallbackException;


/**
 * Callback handler that doesn't support anything. This is used when the login is
 * done using a keychain.
 * @author Matthew Buckett
 *
 */
public class NullCallbackHandler implements CallbackHandler {

	public void handle(Callback[] callbacks) throws IOException,
			UnsupportedCallbackException {
		for (Callback callback: callbacks) {
			throw new UnsupportedCallbackException(callback, "Can't handle any callbacks");
		}

	}

}
